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1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 */
16
17
18#include <linux/init.h>
19#include <linux/slab.h>
20#include <linux/usb.h>
21#include <linux/usb/audio.h>
22#include <linux/usb/audio-v2.h>
23#include <linux/usb/audio-v3.h>
24
25#include <sound/core.h>
26#include <sound/pcm.h>
27#include <sound/control.h>
28#include <sound/tlv.h>
29
30#include "usbaudio.h"
31#include "card.h"
32#include "proc.h"
33#include "quirks.h"
34#include "endpoint.h"
35#include "pcm.h"
36#include "helper.h"
37#include "format.h"
38#include "clock.h"
39#include "stream.h"
40
41/*
42 * free a substream
43 */
44static void free_substream(struct snd_usb_substream *subs)
45{
46 struct audioformat *fp, *n;
47
48 if (!subs->num_formats)
49 return; /* not initialized */
50 list_for_each_entry_safe(fp, n, &subs->fmt_list, list) {
51 kfree(fp->rate_table);
52 kfree(fp->chmap);
53 kfree(fp);
54 }
55 kfree(subs->rate_list.list);
56}
57
58
59/*
60 * free a usb stream instance
61 */
62static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
63{
64 free_substream(&stream->substream[0]);
65 free_substream(&stream->substream[1]);
66 list_del(&stream->list);
67 kfree(stream);
68}
69
70static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
71{
72 struct snd_usb_stream *stream = pcm->private_data;
73 if (stream) {
74 stream->pcm = NULL;
75 snd_usb_audio_stream_free(stream);
76 }
77}
78
79/*
80 * initialize the substream instance.
81 */
82
83static void snd_usb_init_substream(struct snd_usb_stream *as,
84 int stream,
85 struct audioformat *fp)
86{
87 struct snd_usb_substream *subs = &as->substream[stream];
88
89 INIT_LIST_HEAD(&subs->fmt_list);
90 spin_lock_init(&subs->lock);
91
92 subs->stream = as;
93 subs->direction = stream;
94 subs->dev = as->chip->dev;
95 subs->txfr_quirk = as->chip->txfr_quirk;
96 subs->tx_length_quirk = as->chip->tx_length_quirk;
97 subs->speed = snd_usb_get_speed(subs->dev);
98 subs->pkt_offset_adj = 0;
99
100 snd_usb_set_pcm_ops(as->pcm, stream);
101
102 list_add_tail(&fp->list, &subs->fmt_list);
103 subs->formats |= fp->formats;
104 subs->num_formats++;
105 subs->fmt_type = fp->fmt_type;
106 subs->ep_num = fp->endpoint;
107 if (fp->channels > subs->channels_max)
108 subs->channels_max = fp->channels;
109}
110
111/* kctl callbacks for usb-audio channel maps */
112static int usb_chmap_ctl_info(struct snd_kcontrol *kcontrol,
113 struct snd_ctl_elem_info *uinfo)
114{
115 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
116 struct snd_usb_substream *subs = info->private_data;
117
118 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
119 uinfo->count = subs->channels_max;
120 uinfo->value.integer.min = 0;
121 uinfo->value.integer.max = SNDRV_CHMAP_LAST;
122 return 0;
123}
124
125/* check whether a duplicated entry exists in the audiofmt list */
126static bool have_dup_chmap(struct snd_usb_substream *subs,
127 struct audioformat *fp)
128{
129 struct audioformat *prev = fp;
130
131 list_for_each_entry_continue_reverse(prev, &subs->fmt_list, list) {
132 if (prev->chmap &&
133 !memcmp(prev->chmap, fp->chmap, sizeof(*fp->chmap)))
134 return true;
135 }
136 return false;
137}
138
139static int usb_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
140 unsigned int size, unsigned int __user *tlv)
141{
142 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
143 struct snd_usb_substream *subs = info->private_data;
144 struct audioformat *fp;
145 unsigned int __user *dst;
146 int count = 0;
147
148 if (size < 8)
149 return -ENOMEM;
150 if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
151 return -EFAULT;
152 size -= 8;
153 dst = tlv + 2;
154 list_for_each_entry(fp, &subs->fmt_list, list) {
155 int i, ch_bytes;
156
157 if (!fp->chmap)
158 continue;
159 if (have_dup_chmap(subs, fp))
160 continue;
161 /* copy the entry */
162 ch_bytes = fp->chmap->channels * 4;
163 if (size < 8 + ch_bytes)
164 return -ENOMEM;
165 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
166 put_user(ch_bytes, dst + 1))
167 return -EFAULT;
168 dst += 2;
169 for (i = 0; i < fp->chmap->channels; i++, dst++) {
170 if (put_user(fp->chmap->map[i], dst))
171 return -EFAULT;
172 }
173
174 count += 8 + ch_bytes;
175 size -= 8 + ch_bytes;
176 }
177 if (put_user(count, tlv + 1))
178 return -EFAULT;
179 return 0;
180}
181
182static int usb_chmap_ctl_get(struct snd_kcontrol *kcontrol,
183 struct snd_ctl_elem_value *ucontrol)
184{
185 struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
186 struct snd_usb_substream *subs = info->private_data;
187 struct snd_pcm_chmap_elem *chmap = NULL;
188 int i;
189
190 memset(ucontrol->value.integer.value, 0,
191 sizeof(ucontrol->value.integer.value));
192 if (subs->cur_audiofmt)
193 chmap = subs->cur_audiofmt->chmap;
194 if (chmap) {
195 for (i = 0; i < chmap->channels; i++)
196 ucontrol->value.integer.value[i] = chmap->map[i];
197 }
198 return 0;
199}
200
201/* create a chmap kctl assigned to the given USB substream */
202static int add_chmap(struct snd_pcm *pcm, int stream,
203 struct snd_usb_substream *subs)
204{
205 struct audioformat *fp;
206 struct snd_pcm_chmap *chmap;
207 struct snd_kcontrol *kctl;
208 int err;
209
210 list_for_each_entry(fp, &subs->fmt_list, list)
211 if (fp->chmap)
212 goto ok;
213 /* no chmap is found */
214 return 0;
215
216 ok:
217 err = snd_pcm_add_chmap_ctls(pcm, stream, NULL, 0, 0, &chmap);
218 if (err < 0)
219 return err;
220
221 /* override handlers */
222 chmap->private_data = subs;
223 kctl = chmap->kctl;
224 kctl->info = usb_chmap_ctl_info;
225 kctl->get = usb_chmap_ctl_get;
226 kctl->tlv.c = usb_chmap_ctl_tlv;
227
228 return 0;
229}
230
231/* convert from USB ChannelConfig bits to ALSA chmap element */
232static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
233 int protocol)
234{
235 static unsigned int uac1_maps[] = {
236 SNDRV_CHMAP_FL, /* left front */
237 SNDRV_CHMAP_FR, /* right front */
238 SNDRV_CHMAP_FC, /* center front */
239 SNDRV_CHMAP_LFE, /* LFE */
240 SNDRV_CHMAP_SL, /* left surround */
241 SNDRV_CHMAP_SR, /* right surround */
242 SNDRV_CHMAP_FLC, /* left of center */
243 SNDRV_CHMAP_FRC, /* right of center */
244 SNDRV_CHMAP_RC, /* surround */
245 SNDRV_CHMAP_SL, /* side left */
246 SNDRV_CHMAP_SR, /* side right */
247 SNDRV_CHMAP_TC, /* top */
248 0 /* terminator */
249 };
250 static unsigned int uac2_maps[] = {
251 SNDRV_CHMAP_FL, /* front left */
252 SNDRV_CHMAP_FR, /* front right */
253 SNDRV_CHMAP_FC, /* front center */
254 SNDRV_CHMAP_LFE, /* LFE */
255 SNDRV_CHMAP_RL, /* back left */
256 SNDRV_CHMAP_RR, /* back right */
257 SNDRV_CHMAP_FLC, /* front left of center */
258 SNDRV_CHMAP_FRC, /* front right of center */
259 SNDRV_CHMAP_RC, /* back center */
260 SNDRV_CHMAP_SL, /* side left */
261 SNDRV_CHMAP_SR, /* side right */
262 SNDRV_CHMAP_TC, /* top center */
263 SNDRV_CHMAP_TFL, /* top front left */
264 SNDRV_CHMAP_TFC, /* top front center */
265 SNDRV_CHMAP_TFR, /* top front right */
266 SNDRV_CHMAP_TRL, /* top back left */
267 SNDRV_CHMAP_TRC, /* top back center */
268 SNDRV_CHMAP_TRR, /* top back right */
269 SNDRV_CHMAP_TFLC, /* top front left of center */
270 SNDRV_CHMAP_TFRC, /* top front right of center */
271 SNDRV_CHMAP_LLFE, /* left LFE */
272 SNDRV_CHMAP_RLFE, /* right LFE */
273 SNDRV_CHMAP_TSL, /* top side left */
274 SNDRV_CHMAP_TSR, /* top side right */
275 SNDRV_CHMAP_BC, /* bottom center */
276 SNDRV_CHMAP_RLC, /* back left of center */
277 SNDRV_CHMAP_RRC, /* back right of center */
278 0 /* terminator */
279 };
280 struct snd_pcm_chmap_elem *chmap;
281 const unsigned int *maps;
282 int c;
283
284 if (channels > ARRAY_SIZE(chmap->map))
285 return NULL;
286
287 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
288 if (!chmap)
289 return NULL;
290
291 maps = protocol == UAC_VERSION_2 ? uac2_maps : uac1_maps;
292 chmap->channels = channels;
293 c = 0;
294
295 if (bits) {
296 for (; bits && *maps; maps++, bits >>= 1)
297 if (bits & 1)
298 chmap->map[c++] = *maps;
299 } else {
300 /* If we're missing wChannelConfig, then guess something
301 to make sure the channel map is not skipped entirely */
302 if (channels == 1)
303 chmap->map[c++] = SNDRV_CHMAP_MONO;
304 else
305 for (; c < channels && *maps; maps++)
306 chmap->map[c++] = *maps;
307 }
308
309 for (; c < channels; c++)
310 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
311
312 return chmap;
313}
314
315/* UAC3 device stores channels information in Cluster Descriptors */
316static struct
317snd_pcm_chmap_elem *convert_chmap_v3(struct uac3_cluster_header_descriptor
318 *cluster)
319{
320 unsigned int channels = cluster->bNrChannels;
321 struct snd_pcm_chmap_elem *chmap;
322 void *p = cluster;
323 int len, c;
324
325 if (channels > ARRAY_SIZE(chmap->map))
326 return NULL;
327
328 chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
329 if (!chmap)
330 return NULL;
331
332 len = le16_to_cpu(cluster->wLength);
333 c = 0;
334 p += sizeof(struct uac3_cluster_header_descriptor);
335
336 while (((p - (void *)cluster) < len) && (c < channels)) {
337 struct uac3_cluster_segment_descriptor *cs_desc = p;
338 u16 cs_len;
339 u8 cs_type;
340
341 cs_len = le16_to_cpu(cs_desc->wLength);
342 cs_type = cs_desc->bSegmentType;
343
344 if (cs_type == UAC3_CHANNEL_INFORMATION) {
345 struct uac3_cluster_information_segment_descriptor *is = p;
346 unsigned char map;
347
348 /*
349 * TODO: this conversion is not complete, update it
350 * after adding UAC3 values to asound.h
351 */
352 switch (is->bChRelationship) {
353 case UAC3_CH_MONO:
354 map = SNDRV_CHMAP_MONO;
355 break;
356 case UAC3_CH_LEFT:
357 case UAC3_CH_FRONT_LEFT:
358 case UAC3_CH_HEADPHONE_LEFT:
359 map = SNDRV_CHMAP_FL;
360 break;
361 case UAC3_CH_RIGHT:
362 case UAC3_CH_FRONT_RIGHT:
363 case UAC3_CH_HEADPHONE_RIGHT:
364 map = SNDRV_CHMAP_FR;
365 break;
366 case UAC3_CH_FRONT_CENTER:
367 map = SNDRV_CHMAP_FC;
368 break;
369 case UAC3_CH_FRONT_LEFT_OF_CENTER:
370 map = SNDRV_CHMAP_FLC;
371 break;
372 case UAC3_CH_FRONT_RIGHT_OF_CENTER:
373 map = SNDRV_CHMAP_FRC;
374 break;
375 case UAC3_CH_SIDE_LEFT:
376 map = SNDRV_CHMAP_SL;
377 break;
378 case UAC3_CH_SIDE_RIGHT:
379 map = SNDRV_CHMAP_SR;
380 break;
381 case UAC3_CH_BACK_LEFT:
382 map = SNDRV_CHMAP_RL;
383 break;
384 case UAC3_CH_BACK_RIGHT:
385 map = SNDRV_CHMAP_RR;
386 break;
387 case UAC3_CH_BACK_CENTER:
388 map = SNDRV_CHMAP_RC;
389 break;
390 case UAC3_CH_BACK_LEFT_OF_CENTER:
391 map = SNDRV_CHMAP_RLC;
392 break;
393 case UAC3_CH_BACK_RIGHT_OF_CENTER:
394 map = SNDRV_CHMAP_RRC;
395 break;
396 case UAC3_CH_TOP_CENTER:
397 map = SNDRV_CHMAP_TC;
398 break;
399 case UAC3_CH_TOP_FRONT_LEFT:
400 map = SNDRV_CHMAP_TFL;
401 break;
402 case UAC3_CH_TOP_FRONT_RIGHT:
403 map = SNDRV_CHMAP_TFR;
404 break;
405 case UAC3_CH_TOP_FRONT_CENTER:
406 map = SNDRV_CHMAP_TFC;
407 break;
408 case UAC3_CH_TOP_FRONT_LOC:
409 map = SNDRV_CHMAP_TFLC;
410 break;
411 case UAC3_CH_TOP_FRONT_ROC:
412 map = SNDRV_CHMAP_TFRC;
413 break;
414 case UAC3_CH_TOP_SIDE_LEFT:
415 map = SNDRV_CHMAP_TSL;
416 break;
417 case UAC3_CH_TOP_SIDE_RIGHT:
418 map = SNDRV_CHMAP_TSR;
419 break;
420 case UAC3_CH_TOP_BACK_LEFT:
421 map = SNDRV_CHMAP_TRL;
422 break;
423 case UAC3_CH_TOP_BACK_RIGHT:
424 map = SNDRV_CHMAP_TRR;
425 break;
426 case UAC3_CH_TOP_BACK_CENTER:
427 map = SNDRV_CHMAP_TRC;
428 break;
429 case UAC3_CH_BOTTOM_CENTER:
430 map = SNDRV_CHMAP_BC;
431 break;
432 case UAC3_CH_LOW_FREQUENCY_EFFECTS:
433 map = SNDRV_CHMAP_LFE;
434 break;
435 case UAC3_CH_LFE_LEFT:
436 map = SNDRV_CHMAP_LLFE;
437 break;
438 case UAC3_CH_LFE_RIGHT:
439 map = SNDRV_CHMAP_RLFE;
440 break;
441 case UAC3_CH_RELATIONSHIP_UNDEFINED:
442 default:
443 map = SNDRV_CHMAP_UNKNOWN;
444 break;
445 }
446 chmap->map[c++] = map;
447 }
448 p += cs_len;
449 }
450
451 if (channels < c)
452 pr_err("%s: channel number mismatch\n", __func__);
453
454 chmap->channels = channels;
455
456 for (; c < channels; c++)
457 chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
458
459 return chmap;
460}
461
462/*
463 * add this endpoint to the chip instance.
464 * if a stream with the same endpoint already exists, append to it.
465 * if not, create a new pcm stream. note, fp is added to the substream
466 * fmt_list and will be freed on the chip instance release. do not free
467 * fp or do remove it from the substream fmt_list to avoid double-free.
468 */
469int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
470 int stream,
471 struct audioformat *fp)
472{
473 struct snd_usb_stream *as;
474 struct snd_usb_substream *subs;
475 struct snd_pcm *pcm;
476 int err;
477
478 list_for_each_entry(as, &chip->pcm_list, list) {
479 if (as->fmt_type != fp->fmt_type)
480 continue;
481 subs = &as->substream[stream];
482 if (subs->ep_num == fp->endpoint) {
483 list_add_tail(&fp->list, &subs->fmt_list);
484 subs->num_formats++;
485 subs->formats |= fp->formats;
486 return 0;
487 }
488 }
489 /* look for an empty stream */
490 list_for_each_entry(as, &chip->pcm_list, list) {
491 if (as->fmt_type != fp->fmt_type)
492 continue;
493 subs = &as->substream[stream];
494 if (subs->ep_num)
495 continue;
496 err = snd_pcm_new_stream(as->pcm, stream, 1);
497 if (err < 0)
498 return err;
499 snd_usb_init_substream(as, stream, fp);
500 return add_chmap(as->pcm, stream, subs);
501 }
502
503 /* create a new pcm */
504 as = kzalloc(sizeof(*as), GFP_KERNEL);
505 if (!as)
506 return -ENOMEM;
507 as->pcm_index = chip->pcm_devs;
508 as->chip = chip;
509 as->fmt_type = fp->fmt_type;
510 err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
511 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
512 stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
513 &pcm);
514 if (err < 0) {
515 kfree(as);
516 return err;
517 }
518 as->pcm = pcm;
519 pcm->private_data = as;
520 pcm->private_free = snd_usb_audio_pcm_free;
521 pcm->info_flags = 0;
522 if (chip->pcm_devs > 0)
523 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
524 else
525 strcpy(pcm->name, "USB Audio");
526
527 snd_usb_init_substream(as, stream, fp);
528
529 /*
530 * Keep using head insertion for M-Audio Audiophile USB (tm) which has a
531 * fix to swap capture stream order in conf/cards/USB-audio.conf
532 */
533 if (chip->usb_id == USB_ID(0x0763, 0x2003))
534 list_add(&as->list, &chip->pcm_list);
535 else
536 list_add_tail(&as->list, &chip->pcm_list);
537
538 chip->pcm_devs++;
539
540 snd_usb_proc_pcm_format_add(as);
541
542 return add_chmap(pcm, stream, &as->substream[stream]);
543}
544
545static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
546 struct usb_host_interface *alts,
547 int protocol, int iface_no)
548{
549 /* parsed with a v1 header here. that's ok as we only look at the
550 * header first which is the same for both versions */
551 struct uac_iso_endpoint_descriptor *csep;
552 struct usb_interface_descriptor *altsd = get_iface_desc(alts);
553 int attributes = 0;
554
555 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
556
557 /* Creamware Noah has this descriptor after the 2nd endpoint */
558 if (!csep && altsd->bNumEndpoints >= 2)
559 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
560
561 /*
562 * If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
563 * bytes after the first endpoint, go search the entire interface.
564 * Some devices have it directly *before* the standard endpoint.
565 */
566 if (!csep)
567 csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
568
569 if (!csep || csep->bLength < 7 ||
570 csep->bDescriptorSubtype != UAC_EP_GENERAL) {
571 usb_audio_warn(chip,
572 "%u:%d : no or invalid class specific endpoint descriptor\n",
573 iface_no, altsd->bAlternateSetting);
574 return 0;
575 }
576
577 if (protocol == UAC_VERSION_1) {
578 attributes = csep->bmAttributes;
579 } else if (protocol == UAC_VERSION_2) {
580 struct uac2_iso_endpoint_descriptor *csep2 =
581 (struct uac2_iso_endpoint_descriptor *) csep;
582
583 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
584
585 /* emulate the endpoint attributes of a v1 device */
586 if (csep2->bmControls & UAC2_CONTROL_PITCH)
587 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
588 } else { /* UAC_VERSION_3 */
589 struct uac3_iso_endpoint_descriptor *csep3 =
590 (struct uac3_iso_endpoint_descriptor *) csep;
591
592 /* emulate the endpoint attributes of a v1 device */
593 if (le32_to_cpu(csep3->bmControls) & UAC2_CONTROL_PITCH)
594 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
595 }
596
597 return attributes;
598}
599
600/* find an input terminal descriptor (either UAC1 or UAC2) with the given
601 * terminal id
602 */
603static void *
604snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
605 int terminal_id)
606{
607 struct uac2_input_terminal_descriptor *term = NULL;
608
609 while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
610 ctrl_iface->extralen,
611 term, UAC_INPUT_TERMINAL))) {
612 if (term->bTerminalID == terminal_id)
613 return term;
614 }
615
616 return NULL;
617}
618
619static void *
620snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
621 int terminal_id)
622{
623 /* OK to use with both UAC2 and UAC3 */
624 struct uac2_output_terminal_descriptor *term = NULL;
625
626 while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
627 ctrl_iface->extralen,
628 term, UAC_OUTPUT_TERMINAL))) {
629 if (term->bTerminalID == terminal_id)
630 return term;
631 }
632
633 return NULL;
634}
635
636int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
637{
638 struct usb_device *dev;
639 struct usb_interface *iface;
640 struct usb_host_interface *alts;
641 struct usb_interface_descriptor *altsd;
642 int i, altno, err, stream;
643 u64 format = 0;
644 unsigned int num_channels = 0;
645 struct audioformat *fp = NULL;
646 int num, protocol, clock = 0;
647 struct uac_format_type_i_continuous_descriptor *fmt = NULL;
648 struct snd_pcm_chmap_elem *chmap_v3 = NULL;
649 unsigned int chconfig;
650
651 dev = chip->dev;
652
653 /* parse the interface's altsettings */
654 iface = usb_ifnum_to_if(dev, iface_no);
655
656 num = iface->num_altsetting;
657
658 /*
659 * Dallas DS4201 workaround: It presents 5 altsettings, but the last
660 * one misses syncpipe, and does not produce any sound.
661 */
662 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
663 num = 4;
664
665 for (i = 0; i < num; i++) {
666 alts = &iface->altsetting[i];
667 altsd = get_iface_desc(alts);
668 protocol = altsd->bInterfaceProtocol;
669 /* skip invalid one */
670 if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
671 (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
672 altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
673 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
674 altsd->bNumEndpoints < 1 ||
675 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
676 continue;
677 /* must be isochronous */
678 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
679 USB_ENDPOINT_XFER_ISOC)
680 continue;
681 /* check direction */
682 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
683 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
684 altno = altsd->bAlternateSetting;
685
686 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
687 continue;
688
689 /*
690 * Roland audio streaming interfaces are marked with protocols
691 * 0/1/2, but are UAC 1 compatible.
692 */
693 if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
694 altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
695 protocol <= 2)
696 protocol = UAC_VERSION_1;
697
698 chconfig = 0;
699 /* get audio formats */
700 switch (protocol) {
701 default:
702 dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
703 iface_no, altno, protocol);
704 protocol = UAC_VERSION_1;
705 /* fall through */
706
707 case UAC_VERSION_1: {
708 struct uac1_as_header_descriptor *as =
709 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
710 struct uac_input_terminal_descriptor *iterm;
711
712 if (!as) {
713 dev_err(&dev->dev,
714 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
715 iface_no, altno);
716 continue;
717 }
718
719 if (as->bLength < sizeof(*as)) {
720 dev_err(&dev->dev,
721 "%u:%d : invalid UAC_AS_GENERAL desc\n",
722 iface_no, altno);
723 continue;
724 }
725
726 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
727
728 iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
729 as->bTerminalLink);
730 if (iterm) {
731 num_channels = iterm->bNrChannels;
732 chconfig = le16_to_cpu(iterm->wChannelConfig);
733 }
734
735 break;
736 }
737
738 case UAC_VERSION_2: {
739 struct uac2_input_terminal_descriptor *input_term;
740 struct uac2_output_terminal_descriptor *output_term;
741 struct uac2_as_header_descriptor *as =
742 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
743
744 if (!as) {
745 dev_err(&dev->dev,
746 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
747 iface_no, altno);
748 continue;
749 }
750
751 if (as->bLength < sizeof(*as)) {
752 dev_err(&dev->dev,
753 "%u:%d : invalid UAC_AS_GENERAL desc\n",
754 iface_no, altno);
755 continue;
756 }
757
758 num_channels = as->bNrChannels;
759 format = le32_to_cpu(as->bmFormats);
760 chconfig = le32_to_cpu(as->bmChannelConfig);
761
762 /* lookup the terminal associated to this interface
763 * to extract the clock */
764 input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
765 as->bTerminalLink);
766 if (input_term) {
767 clock = input_term->bCSourceID;
768 if (!chconfig && (num_channels == input_term->bNrChannels))
769 chconfig = le32_to_cpu(input_term->bmChannelConfig);
770 break;
771 }
772
773 output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
774 as->bTerminalLink);
775 if (output_term) {
776 clock = output_term->bCSourceID;
777 break;
778 }
779
780 dev_err(&dev->dev,
781 "%u:%d : bogus bTerminalLink %d\n",
782 iface_no, altno, as->bTerminalLink);
783 continue;
784 }
785
786 case UAC_VERSION_3: {
787 struct uac3_input_terminal_descriptor *input_term;
788 struct uac3_output_terminal_descriptor *output_term;
789 struct uac3_as_header_descriptor *as;
790 struct uac3_cluster_header_descriptor *cluster;
791 struct uac3_hc_descriptor_header hc_header;
792 u16 cluster_id, wLength;
793
794 as = snd_usb_find_csint_desc(alts->extra,
795 alts->extralen,
796 NULL, UAC_AS_GENERAL);
797
798 if (!as) {
799 dev_err(&dev->dev,
800 "%u:%d : UAC_AS_GENERAL descriptor not found\n",
801 iface_no, altno);
802 continue;
803 }
804
805 if (as->bLength < sizeof(*as)) {
806 dev_err(&dev->dev,
807 "%u:%d : invalid UAC_AS_GENERAL desc\n",
808 iface_no, altno);
809 continue;
810 }
811
812 cluster_id = le16_to_cpu(as->wClusterDescrID);
813 if (!cluster_id) {
814 dev_err(&dev->dev,
815 "%u:%d : no cluster descriptor\n",
816 iface_no, altno);
817 continue;
818 }
819
820 /*
821 * Get number of channels and channel map through
822 * High Capability Cluster Descriptor
823 *
824 * First step: get High Capability header and
825 * read size of Cluster Descriptor
826 */
827 err = snd_usb_ctl_msg(chip->dev,
828 usb_rcvctrlpipe(chip->dev, 0),
829 UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
830 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
831 cluster_id,
832 snd_usb_ctrl_intf(chip),
833 &hc_header, sizeof(hc_header));
834 if (err < 0)
835 return err;
836 else if (err != sizeof(hc_header)) {
837 dev_err(&dev->dev,
838 "%u:%d : can't get High Capability descriptor\n",
839 iface_no, altno);
840 return -EIO;
841 }
842
843 /*
844 * Second step: allocate needed amount of memory
845 * and request Cluster Descriptor
846 */
847 wLength = le16_to_cpu(hc_header.wLength);
848 cluster = kzalloc(wLength, GFP_KERNEL);
849 if (!cluster)
850 return -ENOMEM;
851 err = snd_usb_ctl_msg(chip->dev,
852 usb_rcvctrlpipe(chip->dev, 0),
853 UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
854 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
855 cluster_id,
856 snd_usb_ctrl_intf(chip),
857 cluster, wLength);
858 if (err < 0) {
859 kfree(cluster);
860 return err;
861 } else if (err != wLength) {
862 dev_err(&dev->dev,
863 "%u:%d : can't get Cluster Descriptor\n",
864 iface_no, altno);
865 kfree(cluster);
866 return -EIO;
867 }
868
869 num_channels = cluster->bNrChannels;
870 chmap_v3 = convert_chmap_v3(cluster);
871
872 kfree(cluster);
873
874 format = le64_to_cpu(as->bmFormats);
875
876 /* lookup the terminal associated to this interface
877 * to extract the clock */
878 input_term = snd_usb_find_input_terminal_descriptor(
879 chip->ctrl_intf,
880 as->bTerminalLink);
881
882 if (input_term) {
883 clock = input_term->bCSourceID;
884 break;
885 }
886
887 output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
888 as->bTerminalLink);
889 if (output_term) {
890 clock = output_term->bCSourceID;
891 break;
892 }
893
894 dev_err(&dev->dev,
895 "%u:%d : bogus bTerminalLink %d\n",
896 iface_no, altno, as->bTerminalLink);
897 continue;
898 }
899 }
900
901 if (protocol == UAC_VERSION_1 || protocol == UAC_VERSION_2) {
902 /* get format type */
903 fmt = snd_usb_find_csint_desc(alts->extra,
904 alts->extralen,
905 NULL, UAC_FORMAT_TYPE);
906 if (!fmt) {
907 dev_err(&dev->dev,
908 "%u:%d : no UAC_FORMAT_TYPE desc\n",
909 iface_no, altno);
910 continue;
911 }
912 if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8))
913 || ((protocol == UAC_VERSION_2) &&
914 (fmt->bLength < 6))) {
915 dev_err(&dev->dev,
916 "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
917 iface_no, altno);
918 continue;
919 }
920
921 /*
922 * Blue Microphones workaround: The last altsetting is
923 * identical with the previous one, except for a larger
924 * packet size, but is actually a mislabeled two-channel
925 * setting; ignore it.
926 */
927 if (fmt->bNrChannels == 1 &&
928 fmt->bSubframeSize == 2 &&
929 altno == 2 && num == 3 &&
930 fp && fp->altsetting == 1 && fp->channels == 1 &&
931 fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
932 protocol == UAC_VERSION_1 &&
933 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
934 fp->maxpacksize * 2)
935 continue;
936 }
937
938 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
939 if (!fp)
940 return -ENOMEM;
941
942 fp->iface = iface_no;
943 fp->altsetting = altno;
944 fp->altset_idx = i;
945 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
946 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
947 fp->datainterval = snd_usb_parse_datainterval(chip, alts);
948 fp->protocol = protocol;
949 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
950 fp->channels = num_channels;
951 if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
952 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
953 * (fp->maxpacksize & 0x7ff);
954 fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol, iface_no);
955 fp->clock = clock;
956 INIT_LIST_HEAD(&fp->list);
957
958 /* some quirks for attributes here */
959 snd_usb_audioformat_attributes_quirk(chip, fp, stream);
960
961 /* ok, let's parse further... */
962 if (protocol == UAC_VERSION_1 || protocol == UAC_VERSION_2) {
963 if (snd_usb_parse_audio_format(chip, fp, format,
964 fmt, stream) < 0) {
965 kfree(fp->rate_table);
966 kfree(fp);
967 fp = NULL;
968 continue;
969 }
970 } else {
971 struct uac3_as_header_descriptor *as;
972
973 as = snd_usb_find_csint_desc(alts->extra,
974 alts->extralen,
975 NULL, UAC_AS_GENERAL);
976
977 if (snd_usb_parse_audio_format_v3(chip, fp, as,
978 stream) < 0) {
979 kfree(fp->rate_table);
980 kfree(fp);
981 fp = NULL;
982 continue;
983 }
984 }
985
986 /* Create chmap */
987 if (fp->channels != num_channels)
988 chconfig = 0;
989
990 if (protocol == UAC_VERSION_3)
991 fp->chmap = chmap_v3;
992 else
993 fp->chmap = convert_chmap(fp->channels, chconfig,
994 protocol);
995
996 dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
997 err = snd_usb_add_audio_stream(chip, stream, fp);
998 if (err < 0) {
999 list_del(&fp->list); /* unlink for avoiding double-free */
1000 kfree(fp->rate_table);
1001 kfree(fp->chmap);
1002 kfree(fp);
1003 return err;
1004 }
1005 /* try to set the interface... */
1006 usb_set_interface(chip->dev, iface_no, altno);
1007 snd_usb_init_pitch(chip, iface_no, alts, fp);
1008 snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
1009 }
1010 return 0;
1011}
1012
1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 */
16
17
18#include <linux/init.h>
19#include <linux/slab.h>
20#include <linux/usb.h>
21#include <linux/usb/audio.h>
22#include <linux/usb/audio-v2.h>
23
24#include <sound/core.h>
25#include <sound/pcm.h>
26
27#include "usbaudio.h"
28#include "card.h"
29#include "proc.h"
30#include "quirks.h"
31#include "endpoint.h"
32#include "pcm.h"
33#include "helper.h"
34#include "format.h"
35#include "clock.h"
36#include "stream.h"
37
38/*
39 * free a substream
40 */
41static void free_substream(struct snd_usb_substream *subs)
42{
43 struct list_head *p, *n;
44
45 if (!subs->num_formats)
46 return; /* not initialized */
47 list_for_each_safe(p, n, &subs->fmt_list) {
48 struct audioformat *fp = list_entry(p, struct audioformat, list);
49 kfree(fp->rate_table);
50 kfree(fp);
51 }
52 kfree(subs->rate_list.list);
53}
54
55
56/*
57 * free a usb stream instance
58 */
59static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
60{
61 free_substream(&stream->substream[0]);
62 free_substream(&stream->substream[1]);
63 list_del(&stream->list);
64 kfree(stream);
65}
66
67static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
68{
69 struct snd_usb_stream *stream = pcm->private_data;
70 if (stream) {
71 stream->pcm = NULL;
72 snd_usb_audio_stream_free(stream);
73 }
74}
75
76/*
77 * initialize the substream instance.
78 */
79
80static void snd_usb_init_substream(struct snd_usb_stream *as,
81 int stream,
82 struct audioformat *fp)
83{
84 struct snd_usb_substream *subs = &as->substream[stream];
85
86 INIT_LIST_HEAD(&subs->fmt_list);
87 spin_lock_init(&subs->lock);
88
89 subs->stream = as;
90 subs->direction = stream;
91 subs->dev = as->chip->dev;
92 subs->txfr_quirk = as->chip->txfr_quirk;
93
94 snd_usb_set_pcm_ops(as->pcm, stream);
95
96 list_add_tail(&fp->list, &subs->fmt_list);
97 subs->formats |= fp->formats;
98 subs->num_formats++;
99 subs->fmt_type = fp->fmt_type;
100 subs->ep_num = fp->endpoint;
101}
102
103/*
104 * add this endpoint to the chip instance.
105 * if a stream with the same endpoint already exists, append to it.
106 * if not, create a new pcm stream.
107 */
108int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
109 int stream,
110 struct audioformat *fp)
111{
112 struct list_head *p;
113 struct snd_usb_stream *as;
114 struct snd_usb_substream *subs;
115 struct snd_pcm *pcm;
116 int err;
117
118 list_for_each(p, &chip->pcm_list) {
119 as = list_entry(p, struct snd_usb_stream, list);
120 if (as->fmt_type != fp->fmt_type)
121 continue;
122 subs = &as->substream[stream];
123 if (subs->ep_num == fp->endpoint) {
124 list_add_tail(&fp->list, &subs->fmt_list);
125 subs->num_formats++;
126 subs->formats |= fp->formats;
127 return 0;
128 }
129 }
130 /* look for an empty stream */
131 list_for_each(p, &chip->pcm_list) {
132 as = list_entry(p, struct snd_usb_stream, list);
133 if (as->fmt_type != fp->fmt_type)
134 continue;
135 subs = &as->substream[stream];
136 if (subs->ep_num)
137 continue;
138 err = snd_pcm_new_stream(as->pcm, stream, 1);
139 if (err < 0)
140 return err;
141 snd_usb_init_substream(as, stream, fp);
142 return 0;
143 }
144
145 /* create a new pcm */
146 as = kzalloc(sizeof(*as), GFP_KERNEL);
147 if (!as)
148 return -ENOMEM;
149 as->pcm_index = chip->pcm_devs;
150 as->chip = chip;
151 as->fmt_type = fp->fmt_type;
152 err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
153 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
154 stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
155 &pcm);
156 if (err < 0) {
157 kfree(as);
158 return err;
159 }
160 as->pcm = pcm;
161 pcm->private_data = as;
162 pcm->private_free = snd_usb_audio_pcm_free;
163 pcm->info_flags = 0;
164 if (chip->pcm_devs > 0)
165 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
166 else
167 strcpy(pcm->name, "USB Audio");
168
169 snd_usb_init_substream(as, stream, fp);
170
171 list_add(&as->list, &chip->pcm_list);
172 chip->pcm_devs++;
173
174 snd_usb_proc_pcm_format_add(as);
175
176 return 0;
177}
178
179static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
180 struct usb_host_interface *alts,
181 int protocol, int iface_no)
182{
183 /* parsed with a v1 header here. that's ok as we only look at the
184 * header first which is the same for both versions */
185 struct uac_iso_endpoint_descriptor *csep;
186 struct usb_interface_descriptor *altsd = get_iface_desc(alts);
187 int attributes = 0;
188
189 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
190
191 /* Creamware Noah has this descriptor after the 2nd endpoint */
192 if (!csep && altsd->bNumEndpoints >= 2)
193 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
194
195 if (!csep || csep->bLength < 7 ||
196 csep->bDescriptorSubtype != UAC_EP_GENERAL) {
197 snd_printk(KERN_WARNING "%d:%u:%d : no or invalid"
198 " class specific endpoint descriptor\n",
199 chip->dev->devnum, iface_no,
200 altsd->bAlternateSetting);
201 return 0;
202 }
203
204 if (protocol == UAC_VERSION_1) {
205 attributes = csep->bmAttributes;
206 } else {
207 struct uac2_iso_endpoint_descriptor *csep2 =
208 (struct uac2_iso_endpoint_descriptor *) csep;
209
210 attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
211
212 /* emulate the endpoint attributes of a v1 device */
213 if (csep2->bmControls & UAC2_CONTROL_PITCH)
214 attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
215 }
216
217 return attributes;
218}
219
220static struct uac2_input_terminal_descriptor *
221 snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
222 int terminal_id)
223{
224 struct uac2_input_terminal_descriptor *term = NULL;
225
226 while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
227 ctrl_iface->extralen,
228 term, UAC_INPUT_TERMINAL))) {
229 if (term->bTerminalID == terminal_id)
230 return term;
231 }
232
233 return NULL;
234}
235
236static struct uac2_output_terminal_descriptor *
237 snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
238 int terminal_id)
239{
240 struct uac2_output_terminal_descriptor *term = NULL;
241
242 while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
243 ctrl_iface->extralen,
244 term, UAC_OUTPUT_TERMINAL))) {
245 if (term->bTerminalID == terminal_id)
246 return term;
247 }
248
249 return NULL;
250}
251
252int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
253{
254 struct usb_device *dev;
255 struct usb_interface *iface;
256 struct usb_host_interface *alts;
257 struct usb_interface_descriptor *altsd;
258 int i, altno, err, stream;
259 int format = 0, num_channels = 0;
260 struct audioformat *fp = NULL;
261 int num, protocol, clock = 0;
262 struct uac_format_type_i_continuous_descriptor *fmt;
263
264 dev = chip->dev;
265
266 /* parse the interface's altsettings */
267 iface = usb_ifnum_to_if(dev, iface_no);
268
269 num = iface->num_altsetting;
270
271 /*
272 * Dallas DS4201 workaround: It presents 5 altsettings, but the last
273 * one misses syncpipe, and does not produce any sound.
274 */
275 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
276 num = 4;
277
278 for (i = 0; i < num; i++) {
279 alts = &iface->altsetting[i];
280 altsd = get_iface_desc(alts);
281 protocol = altsd->bInterfaceProtocol;
282 /* skip invalid one */
283 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
284 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
285 (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
286 altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC) ||
287 altsd->bNumEndpoints < 1 ||
288 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
289 continue;
290 /* must be isochronous */
291 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
292 USB_ENDPOINT_XFER_ISOC)
293 continue;
294 /* check direction */
295 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
296 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
297 altno = altsd->bAlternateSetting;
298
299 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
300 continue;
301
302 /* get audio formats */
303 switch (protocol) {
304 default:
305 snd_printdd(KERN_WARNING "%d:%u:%d: unknown interface protocol %#02x, assuming v1\n",
306 dev->devnum, iface_no, altno, protocol);
307 protocol = UAC_VERSION_1;
308 /* fall through */
309
310 case UAC_VERSION_1: {
311 struct uac1_as_header_descriptor *as =
312 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
313
314 if (!as) {
315 snd_printk(KERN_ERR "%d:%u:%d : UAC_AS_GENERAL descriptor not found\n",
316 dev->devnum, iface_no, altno);
317 continue;
318 }
319
320 if (as->bLength < sizeof(*as)) {
321 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_AS_GENERAL desc\n",
322 dev->devnum, iface_no, altno);
323 continue;
324 }
325
326 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
327 break;
328 }
329
330 case UAC_VERSION_2: {
331 struct uac2_input_terminal_descriptor *input_term;
332 struct uac2_output_terminal_descriptor *output_term;
333 struct uac2_as_header_descriptor *as =
334 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
335
336 if (!as) {
337 snd_printk(KERN_ERR "%d:%u:%d : UAC_AS_GENERAL descriptor not found\n",
338 dev->devnum, iface_no, altno);
339 continue;
340 }
341
342 if (as->bLength < sizeof(*as)) {
343 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_AS_GENERAL desc\n",
344 dev->devnum, iface_no, altno);
345 continue;
346 }
347
348 num_channels = as->bNrChannels;
349 format = le32_to_cpu(as->bmFormats);
350
351 /* lookup the terminal associated to this interface
352 * to extract the clock */
353 input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
354 as->bTerminalLink);
355 if (input_term) {
356 clock = input_term->bCSourceID;
357 break;
358 }
359
360 output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
361 as->bTerminalLink);
362 if (output_term) {
363 clock = output_term->bCSourceID;
364 break;
365 }
366
367 snd_printk(KERN_ERR "%d:%u:%d : bogus bTerminalLink %d\n",
368 dev->devnum, iface_no, altno, as->bTerminalLink);
369 continue;
370 }
371 }
372
373 /* get format type */
374 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_FORMAT_TYPE);
375 if (!fmt) {
376 snd_printk(KERN_ERR "%d:%u:%d : no UAC_FORMAT_TYPE desc\n",
377 dev->devnum, iface_no, altno);
378 continue;
379 }
380 if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8)) ||
381 ((protocol == UAC_VERSION_2) && (fmt->bLength < 6))) {
382 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_FORMAT_TYPE desc\n",
383 dev->devnum, iface_no, altno);
384 continue;
385 }
386
387 /*
388 * Blue Microphones workaround: The last altsetting is identical
389 * with the previous one, except for a larger packet size, but
390 * is actually a mislabeled two-channel setting; ignore it.
391 */
392 if (fmt->bNrChannels == 1 &&
393 fmt->bSubframeSize == 2 &&
394 altno == 2 && num == 3 &&
395 fp && fp->altsetting == 1 && fp->channels == 1 &&
396 fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
397 protocol == UAC_VERSION_1 &&
398 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
399 fp->maxpacksize * 2)
400 continue;
401
402 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
403 if (! fp) {
404 snd_printk(KERN_ERR "cannot malloc\n");
405 return -ENOMEM;
406 }
407
408 fp->iface = iface_no;
409 fp->altsetting = altno;
410 fp->altset_idx = i;
411 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
412 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
413 fp->datainterval = snd_usb_parse_datainterval(chip, alts);
414 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
415 /* num_channels is only set for v2 interfaces */
416 fp->channels = num_channels;
417 if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
418 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
419 * (fp->maxpacksize & 0x7ff);
420 fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol, iface_no);
421 fp->clock = clock;
422
423 /* some quirks for attributes here */
424
425 switch (chip->usb_id) {
426 case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
427 /* Optoplay sets the sample rate attribute although
428 * it seems not supporting it in fact.
429 */
430 fp->attributes &= ~UAC_EP_CS_ATTR_SAMPLE_RATE;
431 break;
432 case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
433 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
434 /* doesn't set the sample rate attribute, but supports it */
435 fp->attributes |= UAC_EP_CS_ATTR_SAMPLE_RATE;
436 break;
437 case USB_ID(0x0763, 0x2001): /* M-Audio Quattro USB */
438 case USB_ID(0x0763, 0x2012): /* M-Audio Fast Track Pro USB */
439 case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
440 case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
441 an older model 77d:223) */
442 /*
443 * plantronics headset and Griffin iMic have set adaptive-in
444 * although it's really not...
445 */
446 fp->ep_attr &= ~USB_ENDPOINT_SYNCTYPE;
447 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
448 fp->ep_attr |= USB_ENDPOINT_SYNC_ADAPTIVE;
449 else
450 fp->ep_attr |= USB_ENDPOINT_SYNC_SYNC;
451 break;
452 }
453
454 /* ok, let's parse further... */
455 if (snd_usb_parse_audio_format(chip, fp, format, fmt, stream, alts) < 0) {
456 kfree(fp->rate_table);
457 kfree(fp);
458 fp = NULL;
459 continue;
460 }
461
462 snd_printdd(KERN_INFO "%d:%u:%d: add audio endpoint %#x\n", dev->devnum, iface_no, altno, fp->endpoint);
463 err = snd_usb_add_audio_stream(chip, stream, fp);
464 if (err < 0) {
465 kfree(fp->rate_table);
466 kfree(fp);
467 return err;
468 }
469 /* try to set the interface... */
470 usb_set_interface(chip->dev, iface_no, altno);
471 snd_usb_init_pitch(chip, iface_no, alts, fp);
472 snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
473 }
474 return 0;
475}
476